Calc5 is a simple web application that lets you perform advanced calculations and plot 2D and 3D graphs.

If you're ever in the need of a quick graph or calculation, this looks like a great tool to have on hand. I know a lot of our readers prefer a quick Google calculation, but you can't get no graphs from the GOOG. If you haven't dusted off your TI-85 in 8 years and you're not sure how to get calculatin' with Calc5, the help page or sample calculations should get you started. — Adam Pash